Programmer Guide/SPU Reference/AVR: Difference between revisions
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The cycle counter ''t'' is initialized with 0 and incremented by 1 after each evaluation cycle. The cycle counter is reset, if the input <var>RS</var> is set to a value greater than <code>0</code>. The input <var>RS</var> is checked each time the SPU is started. | The cycle counter ''t'' is initialized with 0 and incremented by 1 after each evaluation cycle. The cycle counter is reset, if the input <var>RS</var> is set to a value greater than <code>0</code>. The input <var>RS</var> is checked each time the SPU is started. | ||
:;infinite average: | :;infinite average: | ||
::<var>TYP</var>=<code>0</code> or <code>linear</code> | ::<var>TYP</var>=<code>0</code> or <code>linear</code> | ||
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\end{cases} | \end{cases} | ||
</math> | </math> | ||
:;running average: | :;running average: | ||
::<var>TYP</var>=<code>0</code> or <code>linear</code> | ::<var>TYP</var>=<code>0</code> or <code>linear</code> | ||
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\end{cases} | \end{cases} | ||
</math> | </math> | ||
:;exponential average: | :;exponential average: | ||
::<var>TYP</var>=<code> | ::<var>TYP</var>=<code>1</code> or <code>exponential</code> | ||
::<code>0</code><<var>T</var><<code>1</code>; <var>T</var> is the averaging factor | ::<code>0</code><<var>T</var><<code>1</code>; <var>T</var> is the averaging factor | ||
::<math>Y[i,j]_t = | ::<math>Y[i,j]_t = | ||
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\end{cases} | \end{cases} | ||
</math> | </math> | ||
:;minimum: | |||
::<var>TYP</var>=<code>2</code> or <code>minimum</code> | |||
::<code>0</code><<var>T</var><<code>1</code>; <var>T</var> is the averaging factor | |||
::<math>Y[i,j]_t = | |||
\begin{cases} | |||
X[i,j]_t & \mbox{if }t=0 \\ | |||
min(Y[i,j]_{t-1},X[i,j]_t) & \mbox{if }t>0 | |||
\end{cases} | |||
</math> | |||
;See also: | ;See also: | ||
<[[../#Signal Processing Atoms|SP-atoms]]> | <[[../#Signal Processing Atoms|SP-atoms]]> | ||
<!-- AN, 2.5.2011 --> | <!-- AN, 2.5.2011 --> | ||
Revision as of 10:42, 6 May 2011
Average input X over evaluation cycles.
[SPU SUM X TYP T RS OUT Y]
| In: | X | a number, vector or matrix containing the data to be averaged |
|---|---|---|
| TYP | a number or string; defines the averaging method | |
| T | averaging parameter (number); depends on method | |
| RS | reset flag (number) | |
| Out: | Y | averaged input X; same type as X |
- Description
The averaging algorithm is defined by the inputs TYP and T. The atom averages the elements X[i,j]t over evaluation cycles t (i=row index, j=column index, t=cycle counter) and stores the averaged value in the element Y[i,j]t.
The cycle counter t is initialized with 0 and incremented by 1 after each evaluation cycle. The cycle counter is reset, if the input RS is set to a value greater than 0. The input RS is checked each time the SPU is started.
- infinite average
- TYP=
0orlinear - T=
0 - Y[i,j]t={X[i,j]tif t=01t+1(t.Y[i,j]t−1+X[i,j]t)if t>0
- running average
- TYP=
0orlinear - T>
0; T is the (integer) number of averaging cycles - Y[i,j]t={1t+1∑z=0tX[i,j]zif 0⩽t<T1T∑z=0T−1X[i,j]t−zif t⩾T
- exponential average
- TYP=
1orexponential 0<T<1; T is the averaging factor- Y[i,j]t={X[i,j]tif t=0 (or T out of range)T.Y[i,j]t−1+(1−T).X[i,j]tif t>0
- minimum
- TYP=
2orminimum 0<T<1; T is the averaging factor- Y[i,j]t={X[i,j]tif t=0min(Y[i,j]t−1,X[i,j]t)if t>0
- See also
<SP-atoms>
